A region of the Amazon rainforest between Colombia and Brazil, the region of South America
believed to have the highest biodiversity on Earth.[55][56]
The origin of life on Earth is not well understood, but is estimated to have originated
at least 3.5 billion years ago [57][58][59]. Early Earth's environment significantly during
the Audian or Archean period
thought to be different from today's environment [60]. Organisms that emerged here had
basic individual characteristics and self-replicating properties. Once an organism appears,
natural selection and the process of evolution develop that organism into various life forms.
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